Blood Bound Books - Steamy Screams Anthology
Erotic Horror, 750-5000 words. Payment 3/4c per word. Click the link for more info.
Pill Hill Press - Many Anthologies!
Loads of anthologies here, too many to list them all, some paying, some for the love. Various genres - Pill Hill aren't just about Horror.
Library of the Living Dead (& sister imprints) - Various Anthologies
Click the link and scroll down to see various anthologies accepting submissions. Everything from comedy horror to GLBT sci-fi. Most anthologies pay 1c/word.
If you're looking for more markets, Duotrope's Digest is my favourite writer's resource.You can adjust the search parameters easily, to search for markets in a particular genre, by payscale, anthologies only, or something like whether the market accepts electronic submissions. I also signed up to Duotrope so I can log my submissions - it helps to have an accurate indication of how long it'll take for editors to respond, so I know when to query.
Also good is Ralan - plenty of markets listed there as well.